JPH03183664A - Castable refractory - Google Patents
Castable refractoryInfo
- Publication number
- JPH03183664A JPH03183664A JP1319397A JP31939789A JPH03183664A JP H03183664 A JPH03183664 A JP H03183664A JP 1319397 A JP1319397 A JP 1319397A JP 31939789 A JP31939789 A JP 31939789A JP H03183664 A JPH03183664 A JP H03183664A
- Authority
- JP
- Japan
- Prior art keywords
- refractory
- granules
- cracks
- molten metal
- starting materials
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011819 refractory material Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 4
- 239000008187 granular material Substances 0.000 abstract 4
- 239000007858 starting material Substances 0.000 abstract 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract 1
- 230000001902 propagating effect Effects 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 239000011362 coarse particle Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000012798 spherical particle Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011823 monolithic refractory Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は溶融金属容器用不定形耐火物、特にキャスタブ
ル耐火物に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a monolithic refractory for molten metal containers, particularly to a castable refractory.
近年、高級鋼を溶製する必要が高まり、溶鋼鍋における
滞留時間の延長や高温出鋼が要求され、溶鋼鍋の操業条
件はますます苛酷となる傾向にある。また、施工にあた
っては、れんが施工を行う熟練工が不足していることや
、施工に要する時間が長いこと、粉塵等により施工者の
健康に悪影響を及ぼすことなどの理由で、従来のれんが
積みから溶融金属容器のライニングは流し込み等による
不定形化が進められ、キャスタブル耐火物の利用分野は
ますます広がりつつある。In recent years, the need to melt high-grade steel has increased, requiring longer residence times in molten steel ladle and high temperature tapping, and the operating conditions of molten steel ladle are becoming increasingly severe. In addition, due to the lack of skilled bricklaying workers, the long construction time, and the negative impact on the health of the workers due to dust, etc., conventional brickwork has been replaced by melted brickwork. The linings of metal containers are being made into irregular shapes by pouring, etc., and the fields of use of castable refractories are expanding more and more.
ところが、上記キャスタブル耐火物を使用した溶鋼鍋等
のライニングは、鉄皮に拘束された状態になっており、
実際の使用にあたっては、溶融金属から受ける応力のた
めに上記ライニングに層状の亀裂や剥離が発生し、さら
に−旦発生した亀裂や剥離は引き続き一定方向に進行し
ていく傾向がある。However, the lining of molten steel ladle etc. using the above-mentioned castable refractories is constrained by the steel shell,
In actual use, layer-like cracks and peeling occur in the lining due to the stress received from the molten metal, and furthermore, the cracks and peeling that have already occurred tend to continue to progress in a certain direction.
従って、上記亀裂から生しる剥離による損耗量は通常の
溶損による損耗量の１０〜２０倍と大きく、取鍋等の溶
融金属容器の寿命を著しく短命とする要因となっていた
。Therefore, the amount of wear due to peeling caused by the cracks is 10 to 20 times greater than the amount of wear due to normal melting damage, which is a factor that significantly shortens the life of molten metal containers such as ladles.
こうした状況の中、キャスタブル耐火物によるライニン
グの耐用性を向上させるために種々の発明が開示されて
いる。例えば、粗大粒を耐火材料に混合させて亀裂の進
行を防ぐキャスタブル耐火物が提案されているが、上記
粗大粒の粒径は１０ｍｍ以下と比較的小さいために、溶
融金属からの応力が上記粗大粒を回り込む形で伝播して
亀裂が広がり、所期の目的を充分達成することがない問
題があった。Under these circumstances, various inventions have been disclosed to improve the durability of linings made of castable refractories. For example, castable refractories have been proposed in which coarse particles are mixed with a refractory material to prevent the propagation of cracks, but since the coarse particles have a relatively small particle size of 10 mm or less, stress from molten metal There was a problem in that the crack propagated around the grain and spread, making it impossible to fully achieve the intended purpose.
そこで本発明は上記の事情に鑑みて、主に溶融金属容器
に使用するキャスタブル耐火物の耐用性を向上すること
を目的とする。In view of the above circumstances, the present invention aims to improve the durability of castable refractories mainly used in molten metal containers.
上記の目的を達成するために本発明では以下の手段をと
る。すなわち、粒径１０〜６０ｎの角のない滑らかな形
状の粗大粒を、耐火材原料に対し、外掛けで２０〜４０
重量％配合したキャスタブル耐火物である。In order to achieve the above object, the present invention takes the following measures. That is, coarse grains with a grain size of 10 to 60 nm and a smooth shape without corners are added to the refractory material raw material at an external rate of 20 to 40 nm.
It is a castable refractory compounded in weight%.
本発明でキャスタブル耐火物の耐火物原料に配合する粗
大粒の粒径は、１０〜６０ｗが望ましく、１０ｍｍ未満
の粒径であると、溶融金属から受ける応力で生じる亀裂
の進行が周辺組織よりも剛性の高い粗大粒で止められず
、層状の亀裂や剥離が一方向に進行し、耐用性を低下さ
せてしまう。また６０ｍを超える粒径であると、施工作
業性が低下し、好ましくない。In the present invention, the particle size of the coarse particles blended into the refractory raw material for castable refractories is preferably 10 to 60 W. If the particle size is less than 10 mm, cracks caused by stress from the molten metal will progress faster than the surrounding structure. Unable to be stopped by coarse grains with high rigidity, cracks and peeling in layers progress in one direction, reducing durability. Moreover, if the particle size exceeds 60 m, construction workability will be reduced, which is not preferable.
また、上記粗大粒の形状は上記溶融金属からの応力を分
散させ、亀裂の進行の方向を変える作用を有するように
球状また偏平球状などのように角のない滑らかな形状を
有することが望ましい。Further, the shape of the coarse grains preferably has a smooth shape without corners, such as a spherical shape or an oblate spherical shape, so as to disperse stress from the molten metal and change the direction of crack propagation.
さらに、上記粗大粒の配合量が耐火材原料に対し、外掛
けで２０〜４０重量％が望ましく、２０重量％未満であ
ると、亀裂の進行を妨げる効果に乏しく、４０重量％を
超えると施工作業性が低下し、好ましくない。Furthermore, it is desirable that the amount of the above-mentioned coarse particles is 20 to 40% by weight on the outside based on the raw material for the refractory material.If it is less than 20% by weight, the effect of inhibiting the progress of cracks will be poor, and if it exceeds 40% by weight, the construction will be difficult. Workability decreases, which is not preferable.
さらには上記粗大粒は気孔率が３％未満の緻密な組織で
あることが望ましく、気孔率が３％以上では、上記応力
によって粗大粒自身が割れてしまう事態を生じ、さらに
スラグ等の外来成分の浸透を受けやすくなり、ライニン
グの耐用性の低下を招く。Furthermore, it is desirable that the coarse grains have a dense structure with a porosity of less than 3%; if the porosity is more than 3%, the coarse grains themselves may crack due to the stress, and foreign substances such as slag may also be present. This makes the lining more susceptible to penetration, leading to a decrease in the durability of the lining.
また粗大粒の材質は本発明においては特に限定はせず、
例えばＡｌｚＯｚ、Ｍ ｇ Ｏ−Ｓ ｉ Ｏｘ等の公知
の材料が使用可能であるが、融点、熱膨張係数、溶融金
属との反応性等を考えるとＡ １ ｚ Ｏ３が望ましい
。In addition, the material of the coarse grains is not particularly limited in the present invention,
For example, known materials such as AlzOz and MgO-SiOx can be used, but A1zO3 is preferable in consideration of melting point, coefficient of thermal expansion, reactivity with molten metal, etc.
以下、本発明による１実施例に基づいてさらに詳細な説
明を行う。A more detailed explanation will be given below based on one embodiment of the present invention.
本実施例で後述する耐火材料に配合する粗大粒の製造方
法は以下の通りである。The method for producing coarse particles to be mixed into the fireproof material described later in this example is as follows.
すなわち、Ａ ｌ ２０．の粉体をロールパンを用いて
１０〜６０關に造粒し、１６００℃で坑底、焼結させる
ことにより、気孔率３％未満の緻密で滑らかな形状の粗
大粒を得る。That is, A l 20. The powder is granulated into 10 to 60 particles using a roll pan, and sintered at 1600°C at the bottom of the pit to obtain dense and smooth coarse particles with a porosity of less than 3%.
次に第１表に示す配合割合のキャスタブル耐火物の耐火
材原料に対し、実施別品として上記粗大粒を外掛けで３
０重量％加え、混練し、底面の直径１００ｍｍ、高さ１
００ｍの円柱状に成形した試料を製作した。なお、第１
表に示す耐火材原料に上記粗大粒を加えないで、実施別
品と同様の手段で製作した試料を比較測高とする。Next, the above coarse grains were added to the castable refractory raw material with the mixing ratio shown in Table 1 as a separate product at an external rate of 3.
Add 0% by weight, knead, and make the bottom diameter 100mm and height 1.
A sample molded into a cylindrical shape with a length of 00 m was manufactured. In addition, the first
Comparative height measurements were made using samples manufactured in the same manner as the actual product without adding the above-mentioned coarse particles to the refractory materials shown in the table.
上記、実施別品および比較測高を１７００℃の溶鋼に１
５分間ずつ３回にわたって浸漬する溶鋼浸漬試験を行っ
た後、試料の断面を観察した様子をそれぞれ第１図、第
２図に示す。The above-mentioned items and comparative height measurements were taken on molten steel at 1700℃.
After conducting a molten steel immersion test in which the sample was immersed three times for 5 minutes each, the cross-section of the sample was observed as shown in FIGS. 1 and 2, respectively.
第１図で示す本実施測高の断面において、粗大粒１は亀
裂２の進行を妨げるとともに、亀裂２の進行方向を転換
させる働きをしている。第２図に示すように、耐火物の
ｍ織中の亀裂の進行方向は熱応力に対して垂直（図中上
下方向）であるため、上記粗大粒１によって方向を転換
させられた亀裂２が更に他の亀裂２′の進行を妨げる効
果も観察できる。In the cross-section of the actual height measurement shown in FIG. 1, the coarse grains 1 serve to prevent the propagation of the crack 2 and to change the propagation direction of the crack 2. As shown in Fig. 2, the propagation direction of cracks in the m-weave of the refractory is perpendicular to the thermal stress (in the vertical direction in the figure), so the cracks 2 whose direction has been changed by the coarse grains 1 are Furthermore, the effect of inhibiting the progress of other cracks 2' can also be observed.
次に実施別品および比較測高の切断面に観察できる長さ
１ｅｆｆ１以上の亀裂の数を数え、さらにその長さの平
均値を求めた。その結果を第２表に示す。Next, the number of cracks with a length of 1eff1 or more that could be observed on the cut surfaces of the actual product and the comparative height measurement was counted, and the average value of the lengths was determined. The results are shown in Table 2.
亀裂の発生頻度は実施別品、比較測高ともほぼ同等であ
るが、上記長さの平均値は実施別品の方が明らかに低く
、亀裂の進行は粗大粒で止められることがわかる。Although the frequency of occurrence of cracks is almost the same for both the actual product and the comparative height measurement, the average value of the above-mentioned length is clearly lower for the actual product, indicating that the progression of cracks is stopped by coarse grains.
上記のように、耐火材原料に粗大粒を配合した本実施例
は亀裂の進行が従来よりも抑えられ、耐用性の向上した
ライニングが得られる。As described above, in this example, where coarse particles are blended into the refractory material raw material, the progression of cracks is suppressed more than in the conventional case, and a lining with improved durability can be obtained.
尚、本発明は上記実施例に限らず、本発明の趣旨を変え
ない範囲で適宜応用が可能であることはいうまでもない
。It goes without saying that the present invention is not limited to the above embodiments, but can be applied as appropriate without departing from the spirit of the present invention.
く以下余白〉
第
表
耐火材料の配合
第
表
亀裂の数と平均の長さ
※亀裂の長さの平均値は１ｃｒｎ以上の亀裂の長さを平
均した。Table: Refractory Material Composition Table: Number of Cracks and Average Length *The average length of cracks is the average length of cracks of 1 crn or more.
球状粗大粒を配合した本発明によるキャスタブル耐火物
は、使用に伴って生じる亀裂が広がりにくく、ライニン
グの耐用性を向上させ、ひいては溶融金属容器の寿命を
延長する効果を発揮する。The castable refractory according to the present invention containing coarse spherical particles does not easily spread cracks that occur with use, improves the durability of the lining, and has the effect of extending the life of the molten metal container.
第１図は本発明による実施例試料の断面図、第２図は球
状粗大粒を配合しない比較測高の断面図。
図中、
１・・・粗大粒。
本発明しこよる憔価吃品の断面図
第
図
比較４ヶｊ品 の 斯１五コ 図
第
図FIG. 1 is a sectional view of an example sample according to the present invention, and FIG. 2 is a sectional view of a comparative height measurement sample that does not contain coarse spherical particles. In the figure: 1... Coarse grains. A cross-sectional view of the reduced-priced food product according to the present invention.A comparison of four products.
Claims (1)
大粒を、耐火材原料に対し、外掛けで２０〜４０重量％
配合したことを特徴とするキャスタブル耐火物。(1) 20 to 40% by weight of coarse grains with a grain size of 10 to 60 mm and a smooth shape without corners, based on the refractory material raw material.
A castable refractory characterized by the fact that it is a castable refractory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1319397A JPH03183664A (en) | 1989-12-08 | 1989-12-08 | Castable refractory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1319397A JPH03183664A (en) | 1989-12-08 | 1989-12-08 | Castable refractory |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03183664A true JPH03183664A (en) | 1991-08-09 |
Family
ID=18109722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1319397A Pending JPH03183664A (en) | 1989-12-08 | 1989-12-08 | Castable refractory |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03183664A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8685455B2 (en) | 2005-03-31 | 2014-04-01 | Suntory Holdings Limited | Oil-in-water emulsions containing lignan-class compounds and compositions containing the same |
-
1989
- 1989-12-08 JP JP1319397A patent/JPH03183664A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8685455B2 (en) | 2005-03-31 | 2014-04-01 | Suntory Holdings Limited | Oil-in-water emulsions containing lignan-class compounds and compositions containing the same |
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